HEM calibration and bird‐swing correction: An insular example

Macnae, James; Ley-Cooper, Alan Yusen; Davis, Aaron

doi:10.1190/1.3059158

Cited by 1 publication

(1 citation statement)

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“…Accurate measurements of system geometry are not required for measuring the in-phase response with the frequency-domain systems because such systems are rigid. Efforts to improve the calibration of helicopter frequency-domain systems were shown to result in better data being derived from AEM systems (Ley- Cooper and Macnae, 2007;Macnae et al, 2008). A procedure involving a ground loop was devised by Davis and Macnae (2008a, b) to improve understanding of the time-domain waveform shape and of timing and altimeter geometry errors; that procedure also results in derivation of better fidelity information from the data.…”

Section: Other Developments In Systemsmentioning

confidence: 98%

Metalliferous mining geophysics — State of the art after a decade in the new millennium

2011

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Mining exploration was very active during the first decade of the twenty-first century because there were numerous advances in the science and technology that geophysicists were using for mineral exploration. Development came from different sources: instrumentation improvements, new numerical algorithms, and cross-fertilization with the seismic industry. In gravity, gradiometry kept its promise and is on the cusp of becoming a key technology for mining exploration. In potential-field methods in general, numerous techniques have been developed for automatic interpretation, and 3D inversion schemes came into frequent use. These inversions will have even greater use when geologic constraints can be applied easily. In airborne electromagnetic (EM) methods, the development of time-domain helicopter EM systems changed the industry. In parallel, improvements in EM modeling and interpretation occurred; in particular, the strengths and weaknesses of the various algorithms became better understood. Simpler imaging schemes came into standard use, whereas layered inversion seldom is used in the mining industry today. Improvements in ground EM methods were associated with the development of SQUID technology and distributed-acquisition systems; the latter also impacted ground induced-polarization (IP) methods. Developments in borehole geophysics for mining and exploration were numerous. Borehole logging to measure physical properties received significant interest. Perhaps one reason for that interest was the desire to develop links between geophysical and geologic results, which also is a topic of great importance to mining geologists and geophysicists.

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Section: Other Developments In Systemsmentioning

confidence: 98%